Bolt and nut material

2019-01-03View Original

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Why are the bolt and nut materials for carbon steel flanges 8.8 and 8 respectively, with different materials, while the bolts and nuts for stainless steel flanges are all A2-70? Why are the materials different?

Reply #22019-01-03

The numbers 8.8 and 8 denote the performance grade; materials with different performance grades can vary as well. In A2-70, A2 indicates the stainless steel category, while 70 represents the performance grade

Reply #32019-01-03

This post was last edited by zqhlang on 1/3/2019 at 14:44

Reply #42019-01-03

I hadn’t paid attention to such detailed distinctions in material grades; thanks!

Reply #52019-01-03

8.8 is the performance grade, A2-70 is 304 stainless steel

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Bolt and nut material

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